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Finding the Fourth Proportional to 386,999.60, 579,721.80 and 261,028.40

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Solution

The fourth proportional to 386,999.60, 579,721.80 and 261,028.40 is: 391,018.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,999.60 : 579,721.80 = 261,028.40 : x
  2. Step 2: Convert to fraction form
    386,999.60/579,721.80 = 261,028.40/x
  3. Step 3: Cross multiply
    386,999.60x = 579,721.80 × 261,028.40
  4. Step 4: Simplify right side
    386,999.60x = 151,323,853,899.12
  5. Step 5: Solve for x
    x = 151,323,853,899.12/386,999.60
  6. Step 6: Final answer
    x = 391,018.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.